Carbon monoxide (CO) detector powered by replaceable batteries. Designed to accurately measure low levels of CO. Features an advanced electrochemical sensor calibrated and tested in CO gas. Intelligent sensing technology increases the sensing rate upon detection of carbon monoxide. Can be installed in any room containing a fuel-burning appliance e.g gas hob, open fire, boiler. Integrated bracket offers wall-mounted or freestanding use. Suitable for home and / or travel use. Standalone Replaceable Battery (Alkaline) 85dBA Alarm at 3m Test/Hush Button 10-Year Sensor Life Intelligent Sensing Technology Advanced Electrochemical Sensor Wall-Mounted or Freestanding Portable Standalone Replaceable Battery (Alkaline) 85dBA Alarm at 3m Test/Hush Button 10-Year Sensor Life Intelligent Sensing Technology Advanced Electrochemical Sensor Wall-Mounted or Freestanding Portable